 State Route 42 | ||||
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| Route information | ||||
| Maintained by UDOT | ||||
| Length | 7.390 mi[1] (11.893 km) | |||
| Existed | 1912 as a state highway; 1927 as SR-42–present | |||
| Major junctions | ||||
| West end | Idaho state line near Malta, ID | |||
| East end |  SR-30 Curlew Junction | |||
| Location | ||||
| Country | United States | |||
| State | Utah | |||
| Highway system | ||||
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State Route 42 (SR-42) is a 7.390-mile-long (11.893 km) state highway completely within Box Elder County in the U.S. state of Utah. It connects SR-30 to former SH-81 at the Idaho state line. The highway was formerly part of U.S. Route 30S (US-30S), prior to being bypassed and replaced with what is now signed as Interstate 84 (I-84).